نتایج جستجو برای: kinetic rate constant
تعداد نتایج: 1207267 فیلتر نتایج به سال:
attempts to obtain experimental values for the kinetic parameters of phenanthridine oxidation by guinea pig or rabbit liver aldehyde oxidase using common spectrophotometric methods have not been successful due to a lower limit of detection. in the present study, a new spectrofluorimetric assay in combination with a multivariate calibration method for enzymatic kinetic study of aldehyde oxidase ...
Aging of a sheet explosive contain RDX explosive and HTPB binder is studied at temperatures of 50, 60 and 70 oC in times 60, 120 and 180 days. Dynamic-mechanical analysis (DMA), sol – gel analysis (SGA) and hardness measurements methods are used in this research. The changes of tan_delta in DMA, hardness amounts and soluble fraction in SGA are measured for unaged and aged samples. The obtained...
kinetic studies were made of the reactions between triphenylphosphine 1, dialkyl acetylenedicarboxylates 2 in the presence of nh-acid, such as maleimid (as a protic/nucleophilic reagent) 3. to determine the kinetic parameters of the reactions, they were monitored by uv spectrophotometery. the second order fits were automatically drawn and the values of the second order rate constant (k2) were a...
In the present study, advanced oxidation treatment, UV/ was applied to decolourisation of Acid Orange 8 (AO8). The UV radiation was carried out with a 15 W low-pressure mercury lamp. Kinetic model for the decolourisation of the dye was developed based on experimental results and known chemical and photochemical reactions. The observed kinetic reaction constant was determined and correlated as a...
This paper presents the influence of Hybrane H 1500 as a hyperbranched polymer on kinetic parameters of dyeing compounded fiber grade PET polyethylene terephthalate at boil temperature. C.I. Disperse Red 324 as a disperse dye was used for dyeing compounded fiber grade PET. The result was compared with corresponding properties of virgin PET. The dyeing rate constants and diffusion coefficients a...
Background and objectives: Dichloromethane (DCM) is one of the hazardous contaminants of the environment, especially ambient air that threatens human health at both acute and chronic exposures. In this study, the performance of a pilot-scale hybrid bubble column/biofilter (HBCB) bioreactor was studied for the removal of DCM from waste gas streams at steady state. Materials and methods: The expe...
leaching of molybdenite concentrate with hydrogen peroxide in sulfuric acid solution was investigated to determine the effects of reaction time, reaction temperature, h2o2 concentration, h2so4 concentration, pulp density and rotation speed on molybdenum extraction and molybdenite dissolution kinetics, using the taguchi method. from analysis of variance (anova) for molybdenum extraction, the mos...
bioremediation, the process by which microorganisms degrade organic compounds to non-toxic or less toxic substances, has been widely used for cleanup of coastal ecosystems after oil spills. in this study, the hydrocarbon degradation rate and half lives in three bioremediation strategies (natural attenuation, biostimulation, and bioaugmentation) were compared in weathered crude oil (wco) contami...
در واکنش هیدروکسی ترمینیتد پلی بوتادی ان(htpb) و تولوئن دی ایزوسانات(tdi) ، مکانیسم واکنش بصورت رادیکالی آزاد می باشد. با بررسسی ویسکوزیته واکنش بانسبت های مختلف nco/oh =r و در دماهای 50،40 و60درجه سانتیگراد مشخص شد که با افزایش r و دما ، ویسکوزیته پلی یورتان افزایش می یابد. با استفاده از رابطه tk?. ?=?? و با رسم نمودار ln? برحسب زمان می توان ثابت سرعت واکنش را بدست آورد. محدوده ثابت سرعت k1 بی...
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